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Highly Sensitive Liquid M-Z Waveguide Sensor Based on Polymer Suspended Slot Waveguide Structure.

Jiachen Han1, Xihan Wu2, Xuyang Ge1

  • 1College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China.

Polymers
|October 14, 2022
PubMed
Summary

This study introduces a polymer Mach-Zehnder interferometer (MZI) optical sensor utilizing a slot waveguide structure. The novel design significantly enhances sensitivity and lowers detection limits for improved sensing accuracy.

Keywords:
integrated opticsoptical sensingpolymeric Mach–Zehnder interferometerslot waveguide

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Area of Science:

  • Photonics
  • Integrated Optics
  • Chemical Sensing

Background:

  • Integrated waveguide optical sensors offer enhanced sensitivity and reduced detection limits.
  • Slot waveguide structures are crucial for improving sensor performance.
  • Suspended structures can enhance optical field interaction with analytes.

Purpose of the Study:

  • To propose and analyze a polymer Mach-Zehnder interferometer (MZI) optical sensor based on a slot waveguide structure.
  • To investigate the impact of structural parameters on sensor performance at 1550 nm.
  • To enhance sensor accuracy through improved optical field-analyte interaction.

Main Methods:

  • Design and simulation of a polymer MZI optical sensor incorporating a suspended slot waveguide.
  • Analysis of the effects of single waveguide width, slot width, and coupling structure.
  • Optimization of MZI parameters including branch spacing, arm length, branch span, and slot region size.
  • Ensuring single-mode transmission for optimal performance.

Main Results:

  • The designed MZI sensor features a branch spacing of 10 µm, arm length of 2045 µm, branch span of 700 µm, and slot region of 500 µm.
  • Achieved an average sensitivity of 972.1 dB/RIU.
  • Obtained an average detection resolution of 1.6 × 10-6 RIU.
  • Demonstrated performance improvements of 1.5x, 1.6x, and 2.1x compared to suspended strip, non-suspended slot, and non-suspended strip waveguides, respectively.

Conclusions:

  • The proposed suspended slot waveguide MZI sensor significantly enhances sensitivity and detection resolution.
  • The design optimizes optical field-analyte interaction for superior sensing accuracy.
  • This technology holds promise for advanced integrated optical sensing applications.